• to balk at a difficulty
• there is no royal road to sg
• force of gravity, gravitational pull, gravity, pull of gravity
• to come up against a difficulty
• have a hard time of it, to be hard up
• beset with difficulties
• gravitational acceleration
• to iron out difficulties
• to crab, to make difficulties, to raise difficulties
• pulling through of difficulties
• to balk at a difficulty
• to balk at a difficulty