Russian ⇄ English

ей палец в рот не клади stresses
gen.	watch your step with her; she is not to be trifled with
inf.	she is a tough guy
Makarov.	she is not to be trusted
polit.	she can take care of himself, be careful dealing with him
ей пальца в рот не клади
gen.	she is a fly customer; she is a pretty hep boy; she is a tough specimen; she is not to be trifled with; I wouldn't trust as far as I could throw (someone: I wouldn't trust him as far as I could throw him – ему пальца в рот не клади)
idiom.	be very much on the ball; be on one's guard with (someone); be fast on the comeback; she speaks softly and carries a big stick
inf.	you've got to watch your step with him
Makarov.	she needs to be watched
proverb	she is capable of defending her interests; no flies on him
ей пальца в рот не клади!
gen.	you'd better watch out for him!