Today's Parola del Giorno is the pronominal verb, trincerarsi, which means to hide.
The past participle is trincerato. Essere is used in compound tenses.
Note the placement of the accent when conjugated: trincèro, trincèri, ecc.
See the verb used below in its context:
Ogni volta che la sua squadra perde l'allenatore si trincera dietro scuse banali: dal clima sfavorevole ai torti arbitrali.
Every time his team loses he hides behind banal excuses: from the unfavorable weather to refereeing faults.