Answer:
The expression "hold their brothers cheap" means to set a low value on. In the context of the poem, the speaker is suggesting that it is not right for "lesser men" to hold their brothers in low regard or to consider them less valuable or important.
Step-by-step explanation:
The poem is about the idea of equality and the speaker is suggesting that everyone should be treated with respect and dignity, regardless of their status or position in society. The phrase "hold their brothers cheap" implies that some people may not value others as highly as they should, which goes against the idea of treating everyone equally. The speaker is arguing that it is not right for some people to consider themselves superior to others and to treat them poorly because of this belief.