HANG UP - (To) End a conversation.
HANG ON / HOLD ON - (To) Wait for a short time.
CALL BACK - (To) Call sb in return or again.
SPEAK UP - (To) Speak louder.
PICK UP - (To) Answer a call.
CUT OFF - (To) Interrupt a conversation.
PUT THROUGH - (To) Connect one s phone to other.
BREAK UP - (To) Become inaudible.
GET THROUGH - (To) Succeed in speaking to sb.
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English Grammar Tips (I)
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