חָזַק verb: be, grow firm, strong, strengthen

• Qal
  • I.be, grow strong
• Piel
  • 1.make strong (physically)
  • 2.strengthen the hands (accusative) of anyone, sustain, encourage
  • 3.make strong = bold, encourage
  • 4.make firm
  • 5.make rigid, hard, i.e. perverse, obstinate, harden
• Hiphil
  • 1.
    • a.make strong, strengthen
    • b.make firm, the kingdom
    • c.display strength
  • 2.make severe, of battle
  • 3.support
  • 4.repair
  • 5.prevail
  • 6.especially take or keep hold of, seize, grasp
• Hithpael
  • 1.strengthen oneself
  • 2.put forth strength, use one's strength
  • 3.withstand
  • 4.hold strongly with

Strong's H2388 חָזַק: to fasten upon; hence, to seize, be strong (figuratively, courageous, causatively strengthen, cure, help, repair, fortify), obstinate; to bind, restrain, conquer
KJV:aid, amend, × calker, catch, cleave, confirm, be constant, constrain, continue, be of good (take) courage(-ous, -ly), encourage (self), be established, fasten, force, fortify, make hard, harden, help, (lay) hold (fast), lean, maintain, play the man, mend, become (wax) mighty, prevail, be recovered, repair, retain, seize, be (wax) sore, strengthen (self), be stout, be (make, shew, wax) strong(-er), be sure, take (hold), be urgent, behave self valiantly, withstand.

Meanings: Brown-Driver-Briggs (1906) and Strong's Hebrew Dictionary (1890), public domain, via the Open Scriptures Hebrew Bible Project (CC BY 4.0). TWOT numbers for reference only.