1. to work excessively or too hard; to exhaust oneself through excessive labor
Usage: chiefly British spelling; American English typically uses 'overlabor'; transitive or intransitive
2. to elaborate or develop (a point, idea, or argument) excessively; to belabor
Usage: transitive; less common than the first sense

Examples

• She tends to overlabour herself during busy seasons, often working late into the evening.
• The farmer warned his workers not to overlabour the horses in the summer heat.
• The author overlaboured the point about climate change throughout the entire chapter.
• Don't overlabour the dough when making bread, or it will become tough.
• He overlaboured his explanation until everyone lost interest in the topic.
• The team was overlaboured by the demanding project schedule and tight deadlines.