(idiomatic) To make a defense for someone or something, on behalf of another person.

(idiomatic) In a manner which adheres strictly to rules, legal requirements, or official procedures.

Relating to, or having a theme (“subject”) or a topic. / (music) Relating to a melodic subject.

A postage stamp that is part of a thematic collection.

(chiefly non-US) Thanksgiving Day, an American holiday celebrated on the fourth Thursday of November.

(informal) To perform below one's capacities. / (informal) To promise more than one can deliver.

To encounter an uncomfortable situation.

That is where the problem is.

(intransitive, idiomatic) To rebuff, snub or curtly reject someone.

(euphemistic) A condom.