seesaw

Short definition from Wiktionary

Noun

1. 1
   A structure composed of a plank, balanced in the middle, used as a game in which one person goes up as the other goes down.
2. 2
   A series of up-and-down movements.
3. 3
   A series of alternating movements or feelings.
4. 4
   An abnormal breathing pattern caused by airway obstruction, characterized by paradoxical chest and abdominal movement.

Verb

1. 1
   To use a seesaw.
2. 2
   To fluctuate.
3. 3
   To cause to move backward and forward in seesaw fashion.

Adjective

1. 1
   fluctuating.