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think the sun shines out (someone's) backside
To believe a person is better or more important than others or above reproach. (Note: If thought about oneself, it means that they are arrogant, conceited, or self-absorbed. If someone thinks this of another person, it means that they love or admire that person to such a degree as to be blind to any of their potential faults.) Tom has acted like he's such a hotshot after getting the promotion. He thinks the sun shines out his backside! He's absolutely head-over-heels in love with Mary. Even though I find her a bit irritating, he thinks the sun shines out her backside.
as if the sun shines out (someone's) backside
As though someone or oneself is better or more important than others. Various slang and vulgar synonyms for "backside" are often substituted. (Note: If thought about oneself, it means that they are arrogant, conceited, or self-absorbed. If someone thinks this of another person, it means that they love or admire that person to such a degree as to be blinded to any of their potential faults.) Samantha has such an ego and acts as if the sun shines out her backside. He's absolutely head-over-heels in love with Mary. Even though I find her a bit irritating, to him it's as if the sun shines out her backside.
kick up the backside
A forceful gesture or message of some kind (usually delivered with good intentions) that acts as motivation to the (previously unmotivated) recipient. Primarily heard in UK, Australia. The threat of divorce was the kick up the backside he needed to start working on improving his marriage.
bald as a coot
Totally bald. My father had long hair as a teen, but now he's bald as a coot.
get off (one's) backside
rude slang To start being productive. This phrase is often used as an imperative. Get off your backside and help me with this! If you don't get off your backside now, you'll be up all night finishing your paper.
work (one's) backside off
To work really hard (on or at something). I know you thought it was just a silly New Year's resolution, but I've been working my backside off at the gym! Sally and Jim work their backsides off when we hold our user conference—I don't know what I'd do without them!
*bald as a cootand *bald as a baby's backside
completely bald. (*Also: as ~.) If Tom's hair keeps receding like that, he'll be bald as a coot by the time he's thirty. Fred: Now, I'll admit my hair is thinning a little on the top, but—Jane: Thinning? You're not thinning, you're as bald as a baby's backside!
*soft as a baby's bottomand soft as a baby's backside; *soft as down; *soft as silk; *soft as velvet
Cliché very soft and smooth to the touch. (*Also: as ~.) This cloth is as soft as a baby's bottom. The kitten's fur was as soft as down. Your touch is soft as silk. This lotion will make your skin soft as velvet.
a kick up the backsideBRITISH, INFORMAL, RUDE or
a kick in the buttAMERICAN, INFORMAL, RUDE
COMMON If someone or something gives someone a kick up the backside, they shock them into trying harder to do something. I hope this gives him the kick up the backside he needs. Maybe he'll try harder to look for a job now. Note: This expression is often varied. For example, in British English up the arse or in the pants can be used instead of up the backside, and in American English in the ass can be used instead of in the butt. He got four goals. But he needed a kick up the arse before he started to play properly. Note: You can also say that a person or event kicks someone up the backside or in the pants. Did you think universities needed kicking up the backside a little bit? He sometimes had to be kicked in the pants to make full use of his athletic gifts.
n. the buttocks; one’s rear. There is some mustard or something on your backside.