The word 'decrease' means the opposite of 'increase'. Both terms describe the direction of change in quantity, size, or degree. 'Increase' refers to a rise or growth, whereas 'decrease' denotes a reduction or decline. The other options, such as 'enhance', 'grow', and 'amplify', are similar to 'increase' as they either suggest growth or improvement. Therefore, 'decrease' is the correct antonym of 'increase'.
