PLEASE DISREGARD YESTERDAY’S POST. Well, actually, please go on regarding it, but with the knowledge that it was a blatant lie in celebration of April Fools’ Day. Sorry! Here’s a real yojijukugo for the week:

一触即発
i-.sshoku.soku.hatsu

Literally: one – touch – instant – emit

Alternately: An “explosive” situation. A precarious balance that will collapse at a single touch. A hair-trigger.

As soon as they figure out who’s leading, expect the meanest waltz that was ever cut. Source.