施 is a bound morpheme (bound form) that appears in formal compound words. It has two main sense clusters: 'to bestow / to give' (施舍 'give alms', 施予 'grant') and 'to apply / to exert' (施加 'apply', 实施 'implement', 施压 'exert pressure'). It is also a common Chinese surname (e.g., the novelist 施耐庵). Because 施 cannot stand alone in modern spoken Chinese, you should learn it within these compound patterns.