1) Adds a lane 2) Adds a lane to 3) Antonym of tapers 4) Digs into the sides 5) Dilates 6) Expands 7) Expands as a search 8) Expands horizontally 9) Grows amidships 10) Grows broader 11) Increases in capacity 12) Makes broader 13) Reams 14) Reams out 1) Broadens