😐 To show little emotion 🤖 To use fewer motors

to underact

9.6

To design or use a machine with fewer motors than needed so some parts move without power

verb
/ˌʌndərˈækt/

Specialized

: subactuar

To save energy, engineers sometimes underact robotic arms by disabling nonessential motors during transport.

Examples

During testing, the team underacted the prototype so some joints moved only passively.
The robot was designed to underact, leading to some movements being unresponsive.
Designers prefer underacting complex systems when weight constraints limit available actuators.
Why does this model underact during certain tasks?
To save energy, engineers sometimes underact robotic arms by disabling nonessential motors during transport.
Designers often choose to underact their machines when fewer actuators are needed for efficiency.
During development, they had to underact the robot's movements to ensure it met weight requirements.

How Actuated

actuating

6.8

to underact

Specialized

9.6

Surface Forms

underact infinitive

underacted past

underacted past participle

underacting present participle

underacts third person singular

Morphology

underact = act (semi-transparent) = under + act

Morphologically transparent as under- + act, but the engineering sense 'having fewer actuators / insufficiently actuated' is technical and not obvious to a general B1 learner.

Etymology

Underact comes from under- 'not enough' and act 'move or do'. So in engineering, to underact a machine is to give it 'not enough' motors or control, so some parts move without power or only by themselves.