1. to make someone or something sensitive or more sensitive to something
Usage: British spelling
2. to cause an allergic reaction or increased sensitivity to a substance
Usage: medical; British spelling

Examples

• The documentary sensitises viewers to environmental issues.
• Repeated exposure to the chemical sensitises the skin.
• The training programme sensitises staff to cultural differences.
• This medication may sensitise patients to sunlight.
• The campaign sensitises young people to the dangers of smoking.
• Certain foods can sensitise the digestive system over time.