Mettersi (to put or place) is another versatile verb that's used in a variety of idiomatic expressions. Increase your word power by using the phrases listed below in daily conversation.
IDIOMATIC EXPRESSIONS USING METTERSI
mettercela tutto
to do one's best
mettersi a confronto
to compare
mettersi a sedere
to seat oneself
mettersi al brutto
to turn nasty
mettersi giù
to put (or lay) down
mettersi innanzi
to produce
mettersi insieme
to put together
mettersi sotto
to put underneath
mettersi su casa
to set up house
mettersi via
to put away
The verb mettersi can also be used for activities: mettersi a mangiare (start/begin to eat), mettersi a dormire (go to sleep), mettersi a gridare (start/begin to shout), mettersi a piangere (start/begin to cry).
From:https://www.dbfei.com/Article/yidaliyu/201311/7695.html