1. to extend or stretch something beyond safe or reasonable limits
Usage: third person singular present tense of overextend
2. to commit oneself to more activities or obligations than one can handle
Usage: often used reflexively
3. to spend or invest more money than one can afford
Usage: financial context

Examples

• The company overextends its resources trying to expand too quickly.
• She overextends herself by volunteering for too many committees.
• The athlete overextends his knee during the jump and injures himself.
• He overextends his budget buying expensive equipment.
• The military overextends its forces across multiple fronts.
• The rubber band overextends and snaps under pressure.
• The student overextends her schedule with too many classes.