To touch or reach with the toes; chiefly in to toe a (also the) line (or mark, scratch, crack, trig) (trig, n.2), to stand with the tips of one's…

to be loaded for bear(s), to be well prepared for an anticipated confrontation, opponent, emergency, etc.; to be ready for anything; also (jocular…

to cover all the bases and variants: to deal with every aspect of something, prepare for all contingencies.