カチカチ

かちかち
adverb, na-adjective, onomatopoeia
clicking; hard; stiff
1. clicking sound
The sound of hard objects repeatedly clicking or tapping against each other.
マウスをカチカチ()す。
To click the mouse repeatedly.
2. hard; stiff; frozen
Describes something that has become very hard or stiff, often from cold or drying.
パンがカチカチに(かた)くなった。
The bread became rock hard.
緊張(きんちょう)してカチカチになった。
I got stiff from nervousness.

DUAL USAGE:
1. SOUND: Hard clicking noise (mouse, keyboard, heels on floor)
2. STATE: Being very hard, stiff, or frozen

COMMON COLLOCATIONS:

  • カチカチに(こお)る: to freeze solid
  • カチカチに(かた)まる: to become rock hard
  • カチカチ(おと)がする: to make clicking sounds
  • (かた)がカチカチ: stiff shoulders

NUANCE:
Often written in katakana to emphasize the sound aspect, but hiragana is also common.

RELATED WORDS:

  • ガチガチ: even harder/stiffer (stronger emphasis)
  • コチコチ: stiff (especially from cold or tension)