古す · godan verb (-su)
| Form | Positive | Negative |
|---|---|---|
| Dictionary | 古す | 古さない |
| Polite | 古します | 古しません |
| Past polite | 古しました | 古しませんでした |
| Past | 古した | 古さなかった |
| Te-form | 古して | 古さないで |
| Desire | 古したい | 古したくない |
| Potential | 古せる | 古せない |
| Passive | 古される | 古されない |
| Causative | 古させる | 古させない |
| Causative passive | 古させられる | 古させられない |
| Volitional | 古そう | |
| Polite volitional | 古しましょう | |
| Imperative | 古せ | 古すな |
| Conditional | 古せば | 古さなければ |
| Tara conditional | 古したら | 古さなかったら |
godan verb (-su), transitive verb
wear out; make old
Transitive verb meaning to use something until it becomes old or worn out. Often used for clothes, tools, or everyday items.
I plan to keep wearing these shoes until I wear them out.
He wore out his favorite jeans.
worn-out; used; secondhand
old clothes; worn-out clothes; cast-off clothes
wear out (clothing)
wear out; use up; use until worn
worn-out footwear; old shoes; worn-out socks
Derived from the adjective 古い (ふるい, 'old') with the verb-forming suffix す, which adds a transitive/causative sense ('to make old').