The noun struggle has 3 senses (first 3 from tagged texts)
1. (16) struggle, battle -- (an energetic attempt to achieve something; "getting through the crowd was a real struggle"; "he fought a battle for recognition")
2. (11) conflict, struggle, battle -- (an open clash between two opposing groups (or individuals); "the harder the conflict the more glorious the triumph"--Thomas Paine; "police tried to control the battle between the pro- and anti-abortion mobs")
3. (1) struggle -- (strenuous effort; "the struggle to get through the crowd exhausted her")
Overview of verb struggle
The verb struggle has 4 senses (first 4 from tagged texts)
1. (13) fight, struggle -- (make a strenuous or labored effort; "She struggled for years to survive without welfare"; "He fought for breath")
2. (7) struggle -- (to exert strenuous effort against opposition; "he struggled to get free from the rope")
3. (3) clamber, scramble, shin, shinny, skin, struggle, sputter -- (climb awkwardly, as if by scrambling)
4. (2) contend, fight, struggle -- (be engaged in a fight; carry on a fight; "the tribesmen fought each other"; "Siblings are always fighting"; "Militant groups are contending for control of the country")