Use 'clear your throat' to indicate you want to speak or need someone to notice you politely.

Getting Attention

Clearing your throat can also mean you're preparing your voice to speak, often before an audience.

Speech Preparation

It's also a discreet way to interrupt or indicate you disagree without words.

It's used when feeling a physical need to clear an irritation in the throat.

'Clear your throat' often follows consuming food that may leave residues, like seeds or spices.

Many people clear their throat in the morning to expel mucus accumulated overnight.