sharp-elbowed

Especially aggressive in advancing one's own interests, usually while ignoring how doing so affects other people. Holly has always seemed sharp-elbowed to me, so I'm not surprised she undermined you to get that promotion. You've got to be sharp-elbowed if you want to get ahead in this industry.

See also:

have sharp elbows
sharp elbows
elbow (one's) way to the top
style it out
back on (one's) heels
get the cold shoulder
give somebody/get the cold shoulder
(one) just doesn't get it
you just don't get it
just don't/doesn't get it, you/he/she

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