Antonyms for go off the deep end

MOST RELEVANT
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

MORE RELATED WORDS FOR GO OFF THE DEEP END

flip one's wig

verblose one's cool
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.