The phrase "look after fences" can be replaced by several synonyms, such as "maintain boundaries," "secure perimeters," or "protect borders." Another option could be "manage enclosures," which implies a more hands-on approach to fence care. Alternatively, "safeguard barricades" or "defend dividers" convey a sense of vigilance and protection. When considering the upkeep of fences, one could also use "uphold barriers," "preserve barriers," or "sustain partitions." In any case, the synonyms for "look after fences" all share the common goal of ensuring the integrity and functionality of boundary structures.