The English word PARTNER can be conveyed a few ways in ASL.
If you mean "PARTNER" as in a spouse or romantic relationship, a common version is "SHARE + PERSON"
The SHARE + PERSON version of PARTNER can also mean PARTNER in business
SHARE + PERSON:
If you are using "PARTNER" to mean partnership or a business partner, a common version is "COLLABORATE PERSON" or can add "BUSINESS" as well.
PARTNERSHIP:
If you want to refer to "PARTNER" as in 'on a team', one option is to use the sign for "ROOMMATE".
ROOMMATE:
Sample sentence: If you partner asked you to put your career on hold, would you?
Notes: The sign COUPLE can be used to indicate PARTNER-[romantic] as well. It can also mean THOSE-TWO, PAIR.
Additional notes: The sign for SWEETHEART can be used for PARTNER-[romantic] as well. It can also mean BABE, BABY.
SWEETHEART:
Notes:
See: HUSBAND
Notes: