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Related to muscles: muscle building, muscular system
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beer muscles

An inflated notion of one's strength, ego, or bravado due to excess consumption of alcohol (not necessarily beer). When he drinks, Jeff always gets beer muscles and wants to fight every guy in the bar. I tend to get beer muscles when I drink too much, and I find myself trying some new outrageous physical feat to show off to my friends.
See also: beer, muscle

love muscle

slang A man's penis. It's my belief that, in general, men care far more about the size of their love muscles than do the women they sleep with.
See also: love, muscle

muscle in (on someone or something)

to try forcefully to displace someone or take over someone's property, interests, or relationships. Are you trying to muscle in on my scheme? If you try to muscle in, you'll be facing big trouble.
See also: muscle

muscle someone out of something

 and muscle someone out
to force someone out of something; to push someone out of something. (Can be physical or by coercion.) Are you trying to muscle me out of my job? The younger people are muscling out the older ones.
See also: muscle, of, out

not move a muscle

to remain perfectly motionless. Be quiet. Sit there and don't move a muscle. I was so tired I couldn't move a muscle.
See also: move, muscle, not

pull a muscle

to strain a muscle and suffer the attendant pain. I pulled a muscle in my back and can't play golf today.
See also: muscle, pull

flex your/its muscles

to act in a way that shows power or strength This very poor nation is beginning to flex its muscles as an important producer of coffee. Conservatives are flexing their muscles in local elections this fall.
See also: flex, muscle

muscle in on something

to force a way into someone's business or other relationships in order to control them Russell was the governor's closest friend, and he didn't like it when someone tried to muscle in on that relationship. These people pretended to be my friends, but they just wanted to muscle in on my life.
See also: muscle

flex your muscles

to use or increase your influence or power He was a very successful movie actor, but he's decided to flex his muscles on the stage for a while.
Usage notes: sometimes used with an adjective to show a particular kind of influence or power: The attorney general is flexing his legal muscles to enforce gun control laws.
Etymology: from the literal meaning of flex your muscles (to tighten your muscles)
See also: flex, muscle

flex your muscles

if a person or an organization flexes their muscles, they take some action to let people know how powerful they are The latest bomb scare was just the terrorists flexing their muscles - showing us they haven't gone away.
See also: flex, muscle

not move a muscle

to stay completely still She sat without moving a muscle as the nurse injected the anaesthetic.
See Move arse!, move up a gear, move in for the kill, change up with the times, come down in the world
See also: move, muscle

flex one's muscles

Show off one's strength or power, as in The boys love flexing their muscles, or The new department head has decided to flex her muscles. [Early 1900s]
See also: flex, muscle

move a muscle

Bestir oneself even slightly. This idiom is usually put negatively, either with implied criticism, as in She won't move a muscle to help get dinner, or not, as in When I saw the deer, I stayed quite still, not daring to move a muscle. It was first recorded in 1889.
See also: move, muscle

muscle in

Also, muscle in on. Forcibly intrude on or interfere with something, as in The children were determined not to allow the school bully to muscle in, or No more muscling in on our policy decisions! [Colloquial; 1920s]
See also: muscle

flex (one's) muscles

To exhibit or show off one's strength.
See also: flex, muscle
References in classic literature ?
The spoor was but a couple of days old when the two discovered it, which meant that the slow-moving caravan was but a few hours distant from them whose trained and agile muscles could carry their bodies swiftly through the branches above the tangled undergrowth which had impeded the progress of the laden carriers of the white men.
Each hair was about the bigness of a large angleworm, and as the thing moved the muscles of its scalp this awful head-covering seemed to writhe and wriggle and crawl about the fearsome face as though indeed each separate hair was endowed with independent life.
At the first glance his eyes narrowed and his muscles tensed.
Let them relax their watchfulness but for an instant, he knew that his cunning mind and giant muscles would find a way to escape--escape and revenge.
But before ever he could pull the trigger an avalanche of muscle was upon him, and he went down to the rotting vegetation of the jungle with five sinewy fingers at his throat.
Instead of soft muscles and a weak resistance, she was looking upon a veritable Hercules gone mad.
The chest was deep, it is true, cavernously deep; but there were no full-swelling muscles, no wide-spreading shoulders, no clean-limbed straightness, no generous symmetry of outline.
Daylight's muscles tautened a second time, and this time in earnest, until steadily all the energy of his splendid body was applied, and quite imperceptibly, without jerk or strain, the bulky nine hundred pounds rose from the door and swung back and forth, pendulum like, between his legs.
Every bit of flesh an' blood an' muscle is clean right down to the bones--and they're clean, too.
He saw only a naked man-thing, hairless and futile, pitting his puny fangs and soft muscles against his own indomitable savagery, and he charged.
The chin, with the damp black beard, pointed higher in the air as the back muscles stiffened and the chest swelled in an unconscious and instinctive effort to get more air.
The muscles of both hind- and fore-legs were not very thick; but across her shoulders the mare was exceptionally broad, a peculiarity specially striking now that she was lean from training.
And anywhere and everywhere Billy touched, muscles large and small rose up, quivered, and sank down, till the whole body was a ripple of willed quick.
Sadly, I know I am shorn of my strength, And no muscle I move As I lie at full length -- But no matter
My heart stood still at the thought, but mind and muscle responded to the quick decision I was forced to make.