margin, allowance, tolerance, drifting, loose, slack, free rein, license, variable, plain sailing, more...

constrict, restrict, limit

latitude, wiggle room, margin, buffer, cushion, elbow room, more...

more, considerable, little, greater, enough, certain, sufficient, wide, substantial, ample, broad

cutting slack,   buffer time,   margin for error,   room to manoeuvre,   room for change,   a wide berth,   room for manoeuvre,   wide margin