I. stiff·en [ˈstɪfən] 动词 不及物动词
1. stiffen:
II. stiff·en [ˈstɪfən] 动词 trans
1. stiffen (make rigid):
2. stiffen (make more difficult):
3. stiffen (make more severe):
4. stiffen (strengthen):
| I | stiffen | 
|---|---|
| you | stiffen | 
| he/she/it | stiffens | 
| we | stiffen | 
| you | stiffen | 
| they | stiffen | 
| I | stiffened | 
|---|---|
| you | stiffened | 
| he/she/it | stiffened | 
| we | stiffened | 
| you | stiffened | 
| they | stiffened | 
| I | have | stiffened | 
|---|---|---|
| you | have | stiffened | 
| he/she/it | has | stiffened | 
| we | have | stiffened | 
| you | have | stiffened | 
| they | have | stiffened | 
| I | had | stiffened | 
|---|---|---|
| you | had | stiffened | 
| he/she/it | had | stiffened | 
| we | had | stiffened | 
| you | had | stiffened | 
| they | had | stiffened |