There are several synonyms for the phrase "shoot a line," which generally means to tell a tall tale or to boast. One commonly used synonym is "spin a yarn," which refers to telling a long, fanciful story. Another synonym is "blow smoke," which means to exaggerate or deceive with words. Yet another synonym is "bullshit," which is a more direct and vulgar way of saying someone is lying or exaggerating. Other synonyms for "shoot a line" include "fabricate," "embellish," "prevaricate," and "stretch the truth." In general, these synonyms indicate that someone is not being truthful and may be exaggerating or outright lying.