1. pledging or promising more than one can realistically deliver or accomplish
Usage: present participle of overcommit; common in professional and personal contexts
2. allocating or dedicating more resources, time, or effort than is prudent or available
Usage: often used in business, military, or financial contexts

Examples

• She is overcommitting herself by taking on three major projects at once.
• The manager warned the team against overcommitting resources to a single client.
• By overcommitting to social events, he had no time for his studies.
• The company is overcommitting its budget to marketing without considering other needs.
• He tends to avoid overcommitting by being realistic about his schedule.
• Overcommitting troops to one front left the army vulnerable elsewhere.