هُمَا يَتَكَايَدَانِ

(L, K) They two deceive, beguile, or circumvent, each other; or do so, each desiring to do to the other a foul, abominable, or evil, action clandestinely. (TK.) See 1. You should not say يَتَكَاوَدَانِ. (L, K.)

Perseus ID: n37391