צוּם (tsûwmtsoomverbabstain from food)
[Heb] צוּם ETCBC: צום‎ (verb|fast) OSHL: r.bc.aa TWOT: 1890 GK: H7426 Greek: νηστεύω
Derivation: a primitive root;
Strong's: to cover over (the mouth), i.e. to fast
KJV: [idiom] at all, fast.