Meaning : Activity involved in maintaining something in good working order.
Example :
He wrote the manual on car care.
Synonyms : care, maintenance
Meaning : The act of sustaining life by food or providing a means of subsistence.
Example :
They were in want of sustenance.
Fishing was their main sustainment.
Synonyms : maintenance, sustainment, sustenance, sustentation
Upkeep meaning in Bengali (Bangla).