What is the meaning of Close_out?

To terminate; to call the end of.

Synonym of close (to make a sale)

Of a wave, to break all at once, instead of progressively along its length.

To terminate a computer program.

To exclude by blocking all opportunities to enter or join.

To make trades offsetting an existing position, leaving the trader with a neutral position.

To seal off.

Source: wiktionary.org