№54 English Idioms 4 with FRIENDS - blow off steam, leave in the air, caution to the wind...

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We keep studying English Idioms, this time I found them in FRIENDS TV show, they are really interesting and useful! Enrich your vocabulary and understand native speakers better!
English - every Monday! Russian - every Wednesday!
1) blow off steam
2) state of the art
3) leave in the air
4) to the rescue
5) throw caution to the wind