allow to fade away (President Obama talked of "reset" with Moscow, agreed to set up a joint committee to look into the matter and then allowed the whole thing to fade away. 4uzhoj); let something drop (Anglophile); let something slide (m_rakova); softpedal (Anglophile); play things cool (Anglophile); drop something (Anglophile); give an easy ride (Abdulla Ivanovich)

to smooth the rough edges (MikeMirgorodskiy)

let it slide (I'll let it slide a couple of times but come on, at some point I'm going to get pissed! 4uzhoj)

спустить на тормозах

: 4 phrases in 3 subjects