population explosion (noun) population explosion: high birthrate
Sinonime: abut, adjoin, be adjacent to,
bind, circumscribe, communicate,
contour,
decorate,
define,
delineate,
edge, encircle,
enclose, flank,
frame,
fringe, hem, join,
line,
march, margin, mark off, neighbor,
outline,
rim, set off,
side, skirt,
surround, touch,
trim, verge
Antonime: be inside,
center