go-ahead什么意思及同义词

go-ahead [英][ˈgəʊəˌhed][美][ˈɡoəˌhɛd]adj.前进着的; 进取的; 有冒险精神的; 可通行的;n.前进，进步; 放行信号; 进取心; 活力，精力;Don't do any major repair work until you get　the go-ahead from your insurers.除...