trả nợ miệng 
to return an invitation to dinner [ trả ] : (1) to pay, repay, pay back; (2) to return, give back
[ nợ ] : debt; to owe, be indebted to
[ miệng ] : mouth, opening
Most Common Compounds Set 1:
Most Common Compounds Set 2 :
trả nợ miệng to return an invitation to dinner