切忌

to avoid as taboo / to avoid by all means

to cut / to slice / tangent (math)

definitely / absolutely (not) / (scoffing or dismissive interjection) Yeah, right. / Tut! / to grind / close to / eager / to correspond to / see also 反切[fan3 qie4]

to be jealous of / fear / dread / scruple / to avoid or abstain from / to quit / to give up sth