0 past simple and past participle of toughen
2 to become difficult to deal with:
Amid toughening competition in the market, many firms are going out of business.
There were still major restrictions on political activities, penalties for illegal strikes were toughened, and government controls were increased.
Toughened laminated glass panels are directly attached to the wooden bars.
Rooflight: flat double glazing, toughened glass over translucent laminated glass, to disguise bird droppings and other dirty deposits.
For each rhizotron, stacks of concrete blocks at each edge held in place a 1-m-square, 6-mm-thick pane of toughened glass against a carefully hand-smoothed, vertical soil face.
I focus here on the top-down part of that story - how the state government toughened up work policies so as to make a work requirement real throughout the state.
New leaves were defined as those that had emerged from bud and were either still expanding, or if full-size, had not yet completely toughened.
The glass units are heat-soak tested toughened glass measuring 6mm / 16mm gap / 10mm inner pane, with 'k' coating on the inner face of the 6mm glass.
It should no longer tolerate excuses for evasion of its sanctions and those sanctions must be toughened and extended.
