Sentence:  This section prescribes that an employer shall ordinarily <WSD>retrench</WSD> the workman who was the last person to be employed in that category, unless for reasons to be recorded in writing, the employer <WSD>retrenches</WSD> any other workman. 
Meaning of the word marked with <WSD> tags:  To terminate the employment of a worker to reduce the size of a workforce; to make redundant.