—trunk /trʌŋk/
noun (MAIN PART)
B2 [C] the thick main stem of a tree, from which its branches grow
See picture: trunk (of a tree) 
Thesaurus+: ↑Parts of plants
F0 [C] the main part of a person's body, not including the head, legs, or arms:
» He's got a thick trunk.See picture: trunk (of a person) Thesaurus+: ↑The human torso
• • •
Extra Examples:» The way that the trunk of a tree divides into smaller and smaller branches and twigs is an approximate fractal pattern.» This tree trunk sounds hollow.» The biggest obstacle in our way was a tree trunk in the road.» He whacked the tree trunk with his stick.» This totem pole is carved out of a single tree trunk.noun [C] (CASE)
► F0 a large, strong case that is used for storing clothes and personal possessions, often when travelling or going to live in a new placeSee picture: trunk (luggage) Thesaurus+: ↑General and miscellaneous containers
noun [C] (NOSE)
► F0 the long, tube-shaped nose of an elephantSee picture: trunk See picture: trunk
Thesaurus+: ↑The head and neck of non-human animals
noun [C] US (UK boot) (CAR)
► B1 a covered space at the back of a car, for storing things in: » I always keep a blanket and a toolkit in the trunk for emergencies.» Her husband's dismembered body was later discovered in the trunk of her car.See picture: (UK) boot/(US) trunk 
Thesaurus+: ↑The exterior of vehicles
noun [plural] (CLOTHES)
trunksF0 (UK ALSO swimming trunks) a piece of men's clothing that covers the hips and bottom and the top part of the legs and is worn when swimming
See picture: swimming trunks See picture: trunks
Thesaurus+: ↑Sportswear and swimwear
F0 a piece of men's underwear that covers the hips and bottom and the top part of the legs