tumbler has definitions from the fields of zoology,food,sport
1
[ noun ] (food) a glass with a flat bottom but no handle or stem; originally had a round bottom

Used in print

(W. H. Gass, "The Pedersen Kid," in The...)

Hans poured some in a tumbler .

Related terms

glass

2
[ noun ] (sport) a gymnast who performs rolls and somersaults and twists etc.

Used in print

(Bonnie Prudden, "The Dancer and the Gymnast"...)

Even if gymnastics are not the ultimate goal , the good tumbler will be a better dancer , a better athlete , and a human_being with a greater margin of safety in any activity .

Related terms

gymnast turner tumble

3
[ noun ] a movable obstruction in a lock that must be adjusted to a given position (as by a key) before the bolt can be thrown

Related terms

obstruction lever pin lock

4
[ noun ] (zoology) pigeon that executes backward somersaults in flight or on the ground

Related terms

domestic_pigeon tumble

*