1A clock, watch, or timepiece — a device for telling time. Comes in many forms: wristwatches, desk clocks, wall clocks, alarm clocks, etc. The kanji 時計 is an ateji (phonetic) spelling, read とけい.
壁の時計が止まっていたので、電池を交換した。
The wall clock had stopped, so I changed the battery.
出かける前に時計を見たら、もう遅刻しそうだった。
When I looked at the clock before heading out, I realized I was about to be late.
誕生日に父から高級な腕時計をもらった。
For my birthday, my father gave me an expensive wristwatch.
スマホがあれば、わざわざ時計を持ち歩かなくてもいい。
If you have a smartphone, you don't need to carry a watch around.
目覚まし時計を止めて、また寝てしまった。
I turned off the alarm clock and ended up falling back asleep.