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harden (one's) heart

To stop or keep someone from feeling kindness and compassion. I worry that all the trauma she's already been through at such a young age will harden her heart.
See also: harden, heart

harden oneself to something

Fig. to make oneself capable of bearing something unpleasant. You will have to learn to harden yourself to tragedies like this. They happen every day in a hospital. She had learned to harden herself to the kinds of poverty she had to work in.
See also: harden

harden something off

to accustom a young plant to normal weather so it can be moved from a protected environment to the out-of-doors. We put the plants by the open window to harden them off. We hardened off the plants.
See also: harden, off

harden something up

to make something hard or strong. Put the meat in the freezer awhile to harden it up before you try to slice it thin. Harden up the ice cream a little in the freezer.
See also: harden, up

harden one's heart

Feel no sympathy for, as in We can't afford to give them more; we'll just have to harden our hearts when they ask . [Late 1300s]
See also: harden, heart

steel one's heart against

Also, harden one's heart. Suppress one's feelings for, as in He finally steeled his heart against them and refused the loan, or You'll just have to harden your heart and tell them the truth. This metaphoric idiom transfers making something hard to rendering oneself insensible or unfeeling. Versions of it date from the late 1500s. Also see heart of stone.
See also: heart, steel

harden your heart

If you harden your heart, you force yourself not to feel love or sympathy for someone or something. Note: The heart is traditionally regarded as the centre of the emotions. The weeping continued. Lionel hardened his heart against the sound. The government's violent response to the mass action will only harden the people's hearts against the ruling party. Note: You can also say that your heart hardens. Anna saw the hurt in her father's eyes and her heart hardened.
See also: harden, heart

ˌharden your ˈheart against somebody/something

no longer be emotionally affected by somebody/something because you feel angry, bitter, etc., towards them/it: Doctors have to harden their hearts against the suffering they see every day.
References in periodicals archive ?
The report also segments the radiation hardened electronics & semiconductors market by components such as processors& controllers, memory devices, power management, FPGAs & ASICs, and other components.
The inclusion of hardened floating-point DSP blocks enable customers to use Altera FPGAs to address the world s most complex HPC problems in big data analytics, seismic modeling for oil and gas industries and financial simulations.
The hardness obtained as a result of the electron beam hardening within the preliminary research proved to be a variable that depends also on the x and z coordinates of the points in the hardened zone.
a standard hardened steel mold over a one-year time period.
It is ideal for use with most hardened alloy steels and provides outstanding toughness in continuous cuts for a wide range of speeds and cutting conditions.
As the lava crept down the slope, its front hardened where it hit thick, glacier-filled valleys, forcing the lava to flow along the line of least resistance, usually the ridges between the valleys.
The company has multiple tactical wheeled vehicles in production now and skilled employees with mine hardened vehicle production expertise in low-cost, low-risk U.
This article presents the effects of principal parameters on the hardness of electron beam hardened layer.
In addition to being stiffer than unused hose, the partly hardened samples also showed a much greater increase in stiffening with accelerated aging, and were much more sensitive to increases in applied load.
It is correct that the surface of an ADI part can be hardened by stressing but most of the hardening is done by a mechanism other than work hardening.
Extensive fossil remains of the largest known seabird, weighing close to 90 pounds with a wingspan of between 18 and 19 feet, have been chipped out of a 30-million-year-old block of hardened sand and mud and identified by scientists at the Charleston (S.
The Proton100k(TM) Radiation Hardened Single Board Computer (RH SBC) is the instrument computer of the Air Force Research Laboratory's (AFRL) RoadRunner On-board Processing Experiment (ROPE), performing data management and processing of focal plane array data.
NASDAQ: XLNX) have signed a licensing agreement to produce the industry's first fully tested and guaranteed radiation hardened Class-S field programmable gate array (FPGA).
First Hardened Diamond Standard Processor Available Reduces SOC Integration Cost