Simple past tense and past participle of tuck in.(verb)
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Use "tucked in" in a sentence
"At night he is safely tucked in my back pocket as we watch slide shows about pollution and its impact on the environment, marvel at how protozoan-inhabited ocean water lights up Day-Glo green when stirred and viewed in the dark, then rally around a campfire to sing jingoistic school songs and to stargaze."
"The white hospital sheets were tightly tucked in all around her, giving her the look of a half-wrapped mummy."
"But even with his suaveness, his passion for conversation, and his charm, the Mouser was grouchy by the end of the day, having to keep his tail tucked in and even sleep on it."