If you leave someone or something out of an activity, collection, discussion, or group, you do not include them in it.
Some would question the wisdom of leaving her out of the team...
If you prefer mild flavours reduce or ~ the chilli...
Now have we left any country out?
PHRASAL VERB: V n P of n, V P n (not pron), V n P
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If someone feels left out, they feel sad because they are not included in a group or activity.
PHRASE: V inflects