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to leave on

to leave on

25 2.3
To let something stay switched on or stay where it is
  • phrasal verb
translation icon : dejar encendido
  • It's just the TV left on.

Anything you leave on this coffee table just vanishes overnight.

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Examples

  • Anything you leave on this coffee table just vanishes overnight.

  • It's just a fan that's been left on.

  • Why are all these lights left on?

  • One narrow window had a light on, probably a bathroom light left on all night.

    Fiction book (1998)
  • The perimeter sensors are still left on.

  • The truck and the light that Schmidt had left on glowed off to the right.

    Fiction book (1991)
  • "The Light Searcher," built by Jonathan Ioviero, electronically searches for lights left on in a house.

    Academic text (2001)
  • Please remember to leave on the lights when you go out so the house looks lived in.

  • You should leave on your jacket if it's still chilly outside.

  • Don't forget to leave on the coffee maker so it's ready for the morning.

Antonyms

1.5

To move something or someone away from a place

37 1.1

To stop a machine or light by using a control such as a button

How Active

running
1.0
to keep on
306 1.4
to leave on
25 2.3
to leave off
  • Informal
104 4.1
to turn off
631 1.3

Surface Forms

leave on infinitive
leaving on present participle
leaves on third person singular
left on past
left on past participle

Morphology

leave + on

The meaning 'to allow something to remain operating' is directly and transparently derived from 'leave' (to leave in a state) combined with 'on' (powered/active). This verb + particle composition follows a common, cross-linguistic pattern (leave + on = leave switched on) and would be readily inferable by a B1 learner who knows both constituents.

Etymology

Leave on comes from the simple image of leaving a switch in the on position. If you leave a lamp switch on, the light keeps working, so leave on means 'to allow something to stay working or in place'.