かっこつける

to affect a stylish air

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かっこつける

try to look good [《口》 cool]; try to make an impression; put on airs; put on a show [an act]; act (cool); pose. [⇒かっこう³]

●「今日は俺のおごりだ」「へっ, かっこつけちゃって!」 “Let me pay today.”―“Wow! How impressive [Cool, man, cool]!”

・かっこつけるなよ. 金に困ってるんだろ. There's no need to try and impress (me) [put on a show]; I know you're badly off.

・かっこつけずに普段着で来いよ. Don't dress up. Just wear what you usually do.

・かっこつけてる場合じゃない. It's no time for heroics.