There are 2 definitions of -t in English:

-t1

suffix

Equivalent to -est2 (as in shalt).

Definition of -t in:

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Word of the day flippant
Pronunciation: ˈflɪp(ə)nt
adjective
not showing a serious or respectful attitude

There are 2 definitions of -t in English:

-t2

suffix

Equivalent to -ed2 (as in crept, sent, spoilt).

Definition of -t in: