How to say they had better have kept their mouths shut. in Japanese
1)
彼ら彼ら(karera) (n,adj-no) those/theyはは(ha) (int) indicating a subject/yes/indeed/well/ha!/what?/huh?/sigh黙ってno dictionary result, likely a conjigated verbno dictionary result, likely a conjigated verbい(prt) strengthens a question, assertion, etc.たほうがよかったno dictionary result, likely a conjigated verbのにのに(noni) (prt) although/when/and yet/despite this/in spite of/even though/but even so/but even then/however/nevertheless/for all that/notwithstanding that/while/if only/i wish/i tell you/you should do/in order to。。(。) Japanese period "."
