"Held up one's end" is an idiom that means to fulfill one's responsibilities or obligations in a particular situation. Conversely, the antonyms for this phrase can include neglecting, ignoring, disregarding, failing, and shirking. Neglecting refers to the act of not giving enough attention to one's responsibilities, while ignoring involves intentionally disregarding and avoiding them. Disregarding signifies not taking something seriously, failing points to incompetence or incapability, and shirking means deliberately avoiding one's duties. In a team or group setting, failing to hold up one's end could lead to negative consequences, such as decreased productivity, strained relationships, and a lack of trust.